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Answered some of my own questions re tire and wheel size
I bought a set of used wheels. Forgeline AL301s. 20 x 9.5 (ET 25) up front; 20 x 10 (ET 35) in the rear. The fronts are too wide for 245/35/20, so I tried 255/35/20. The 255/35/20 were too tall. Now, I'm thinking of trying 265/30/20 upfront. Otherwise, I'm going to ask the manufacturer to install a narrower barrel on the two front wheels. Anyone have experience with 265s up front? Also, I have not found the 20s to be harsh at all. In fact, they feel better to me.
2006 CLS55 AMG Sold 2010 E550 Coupe totaled '13 SL550 current and loving it!
What about a 255/30? 255/35 and 265/30 will be roughly the same height and I am not sure if there is enough room for a 265 width up front. Are you rubbing with the 255/35?
The stock AMG combination has 255/35/19 and 285/30/20. Front wheel diameter is 26" and the rear 26.7"
Right now you have 27.3" diameter in front which why this combo looks funky aka too large. You can go 265/30/20 and should have no issues with rubbing even if you decide to lower the car. I hope you are using 30' in the rear?